diff --git a/launcher/ms_auth.sh b/launcher/ms_auth.sh
new file mode 100755
index 0000000..bd27717
--- /dev/null
+++ b/launcher/ms_auth.sh
@@ -0,0 +1,68 @@
+#!/bin/bash
+function get_client_id() {
+	# sorry polymc, I don't wanna agree to Azure/MS TOS
+	curl https://raw.githubusercontent.com/PolyMC/PolyMC/develop/CMakeLists.txt | grep Launcher_MSA_CLIENT_ID | awk '{print $2}' | sed 's/"//g'	> client_id 
+}
+
+function login() {
+	res="$(curl "https://login.microsoftonline.com/consumers/oauth2/v2.0/devicecode?client_id=$(cat client_id)&scope=XboxLive.signin%20offline_access")"
+	jq '.message' <<< "$res"
+	echo "Press <return> after authenticating"
+	read
+	echo "Fetching token..."
+	curl -s \
+		https://login.microsoftonline.com/consumers/oauth2/v2.0/token \
+		--data 'grant_type=urn:ietf:params:oauth:grant-type:device_code&client_id='"$(cat client_id)"'&device_code='"$(jq -r '.device_code' <<< "$res")" > ms_auth_blob
+
+	json='{
+	    "Properties": {
+	        "AuthMethod": "RPS",
+	        "SiteName": "user.auth.xboxlive.com",
+	        "RpsTicket": "d='"$(jq -r '.access_token' < ms_auth_blob)"'"
+	    },
+	    "RelyingParty": "http://auth.xboxlive.com",
+	    "TokenType": "JWT"
+    }'
+    
+	echo "Talking with XBL..."
+
+	curl -s \
+		https://user.auth.xboxlive.com/user/authenticate \
+		-H "Content-Type: application/json" \
+		--data-raw "$json" > xbl_auth_blob
+
+	xbl_token=$(jq -r '.Token' < xbl_auth_blob)
+	xbl_xui=$(jq -r '.DisplayClaims.xui[0].uhs' < xbl_auth_blob)
+
+	echo "Talking with XSTS..."
+
+	json='
+	{
+		"Properties": {
+		    "SandboxId": "RETAIL",
+		    "UserTokens": [
+		        "'"$xbl_token"'"
+		    ]
+		},
+		"RelyingParty": "rp://api.minecraftservices.com/",
+		"TokenType": "JWT"
+	}'
+
+	curl -s \
+		https://xsts.auth.xboxlive.com/xsts/authorize \
+		-H "Content-Type: application/json" \
+		--data-raw "$json" > xsts_auth_blob
+
+	xsts_token=$(jq -r '.Token' < xsts_auth_blob)
+
+	echo "Talking with minecraftservices..."
+
+	json='{"identityToken": "XBL3.0 x='"$xbl_xui"';'"$xsts_token"'"}'
+
+	curl -s \
+		https://api.minecraftservices.com/authentication/login_with_xbox \
+		-H "Content-Type: application/json" \
+		--data-raw "$json" > auth.json
+		
+	
+}